Frame for bicycles



Y No. 614,905. Patented Nov. 29, I898.

L. STURGES.

FRAME FUR BIGYCLES, &.c.

(Application filed. July 15, 1897.)

mmmmumn i NITED STATES PATENT OFFICE.

LEE STURGES, OF CHICAGO, ILLINOIS.

FRAME FOR BICYCLES, 80c.

SPECIFICATION forming part of Letters Patent N 0. 614,905, dated November 29, 1898. Application filed July 15, 1897. Serial No. 644,662. (No model.)

To all whom it may concern:

Be it known that I, LEE STURGES, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Frames for Bicycles and other Machines, of which the following is a specification.

The invention consists in the features of novelty which are hereinafter fully described with reference to the accompanying drawings, which are made a part hereof, and in which Figure 1 is a side elevation of a portion of the frame of a bicycle embodying the invention in its preferred form. Fig. 2 is a section thereof on the line 2 2, Fig. 1. Fig. 3 is a transverse section thereof on the line 3 3, Fig. 2. Fig. l is a longitudinal section of the inner sleeve which enters into the construction of the cross-head. Fig. 5 is a plan view of the two parts of which the cross-head and stubs are formed. Fig. 6 is an inner face view of one of said parts. Fig. 7 is a diagram showing approximately the shape of the blank from which the part shown in Fig. 6 may be made.

The foregoing figures show the construction of the parts when the fork-arms are joined to the stub through the medium of a single stem.

A represents the lower reach, Bthe kingpost, and O the stem by which the rear forkarms are connected with the cross-head D. This cross-head in the preferred form of the invention is made up of two parts E E and a sleeve F. The part E comprises a tubular portion 6, which is without any longitudinal seam or division, one-half c of the stub for receiving the reach A,on.e-half e of the stub for receiving the king-post B, and one-half e of the stub through the medium of which the fork-arms are connected with the crosshead. The part E comprises similar portions, excepting that they are in reverse, so that when the two parts E and E are brought together the several halves of stubs similarly lettered will unite, thereby completing the stubs for the reach, the king-post and the fork-stem. The peculiarity of this construction is that when the parts are assembled the cross-head will have a transverse seam and no longitudinal seam, while all of the stubs will have longitudinal seams, all of which lie in a single plane, which in the illustration given is strictly perpendicular to the axis of the cross-head; but mathematical accuracy in this respect is not an essential feature of the invention, and any formation of the parts E and E which will avoid a longitudinal seam of the cross-head and seams of the stubs which lie in planes that are longitudinal with respect to the cross-head is within the scope of the invention.

The tube or sleeve F is disposed within the tubular portions 6 e, and its extremities are spun over, as shown at f, for the purpose of more firmly maintaining the proper rela tive positions of the parts E E, and by pref erence the tube is provided on its interior with spun beads f, for limiting the insertion of the cups.

The rear fork-arms G are both made of a single piece of tubing, which is bent at its middle to a practically semicircular shape, so as to provide a curved crown, as shown at g. This crown fits in a socket of corresponding shape in a crown-piece H, having a stem 7L, which telescopes with the stub 3 of the crosshead. This crown-piece is made up of two parts which are of similar shape, each of which parts comprises one-half of the crownpiece and one-half of the stem, the seam being in a plane which cuts both of the forkarms centrally. It will be seen more clearly upon reference to Fig. 3 that the parts of which the fork-stem, considered as a whole, are made break joints with each other-that is to say, in the illustration given the seams of the stub e and stem h lie in planes which are perpendicular to each other. Preferably also these parts are so shaped that the fork-stem is of elliptical cross-section, with its longest diameter horizontal.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

A frame for bicycles, having a cross-head and a stub proceeding rearward from it, said its stem being formed of two parts so shaped cross-head and stub being formed of two parts that the seams of the stem and the stub will so shaped that the seams of the stub will lie break joints, substantially as set forth. in a plane which is transverse to the cross- 5 head, and a fork having a crown-piece pro- Vitnesses:

vided with a stem which telescopes with the N. C. GRIDLEY, stub of the cross-head, said crown-piece and L. M. HOPKINS.

LEE STURGES. 

